I know from a video you can say “lock on/off” but not sure how to set up

Tried to follow these instructions but the options weren’t available on my screen

How do you find Hello Home Phrases?

Head over to your Hello Home Phrases and create a phrase to just unlock the door:

Tap the speech bubble in the upper right corner of the app dashboard
Tap the gear icon in the bottom right corner
Tap “Add an action”
name Action
Set it up to just unlock the door and nothing else
Hit Done

I think Alexa will ignore , block any devices, modes that it thinks contain a lock. So I don’t think you can tell Alexa to unlock your door through a “direct” connection. (For safety reasons)

Smartthings can unlock your door. So you might have to make a virtual switch in smartthings, use that virtual switch as the go between for Alexa and smartthings.

This has been covered here in the forums, will take me as bit to find it. Hopefully someone who has done this recently or who uses Alexa to unlock their door can chime in. I use my routines and presence to control my lock vice Alexa directly.

I'm using an Amazon Echo which now integrates with SmartThings but doesn't support controlling Locks. It can however control switches. In response, I wrote a very simple application that will link the on/off and locked/unlocked state between a switch device and a lock device. Specifically, this means:
Locking the lock will turn on the switch
Unlocking the lock will turn off the switch
Turning on the switch will lock the lock
Turning off the switch will unlock the lock
The result is that SmartApps or device integrations which are able to control a switch device can now control a lock device too.
To use, create a new device with the "On/Off Button Tile" type. Install this app and select your new Button Tile virtual device and a Lock device. This will link the on/off state of the Bu…

There is a YouTube video that explains how to do it and he gives the voice command “Alexa lock on/off” but I’m not a programmer and don’t quite understand nor can I find within the link what I’m supposed to do. Sure I’m just missing a couple of steps

NEW: Alexa IFTTT Triggers
As of November 12, 2015, there are now two official ways to integrate Alexa and SmartThings.
The first way is fast and simple, and can do any one thing that you can do in the official SmartThings IFTTT channel.
You pick any phrase you want to use, and use that as the “if” in the Alexa channel at IFTTT for a new recipe. Then you just pick from the dropdown options in the SmartThings IFTTT channel as the “that.”
To use a recipe, you say “Alexa, trigger {my phrase}.”
So you could say “Alexa, trigger open the pod bay doors” to open your garage door, “Alexa, trigger autodestruct” to turn on your siren, “Alexa, trigger kitchen lights” to turn on your kitchen light. Whatever you want. This is the power of IFTTT, and why SmartThings having a channel there is so u…

Alexa can unlock the door.
After you add it to ST and discover it in Alexa you need to enable opening in the Alexa App.
Go to Smart Home
Find the lock and then clock Unlock by voice and set a voice code.